Multiple frequency digital eddy current inspection system

Details Multiple frequency digital eddy current inspection system Multiple frequency digital eddy current inspection system

1978-04-06

1980-06-10

Rolinec, Rudolph V.

Electricity: measuring and testing

Magnetic

With means to create magnetic field to test material

324233, G01R 3300

Patent

active

042075203

ABSTRACT:
An apparatus for inspecting for cracks under installed fasteners and the like using a multiple frequency digital eddy current system. A computer with a plurality of digital arrays generate drive signals which are converted to analog and applied to the test coil, a second set of digital arrays generate balance signals, are adjusted in amplitude and phase and drive signals so that the output of the test coil is zero in a test specimen, output signals from a work piece are processed in the computer giving phase-sensitive crack detection.

REFERENCES:
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patent: 3688186 (1972-08-01), Judd
patent: 3701941 (1972-10-01), Bantz et al.
patent: 3823368 (1974-07-01), Mansson et al.
patent: 3826976 (1974-07-01), Winston et al.
patent: 4006407 (1977-02-01), Flaherty et al.
patent: 4083002 (1978-04-01), Allport

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